Madrid is about 1.6 times smaller than Indianapolis.

Indianapolis is approximately 935 sq km, while Madrid is approximately 604 sq km, making Madrid 64.63% the size of Indianapolis.
Tip: This to-scale comparison of Indianapolis vs. Madrid uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.